SU1234946A1 - Crystal oscillator - Google Patents

Abstract

The invention relates to radio engineering and m. B. used as a source of high stability; 1ny.h harmonic oscillations. G1 is distinguished by the purity of the generated c / 1bnn. The device contains an oscillator I, a transistor 2, a three-electrode. ea iii ni quartz resonator (TKR) 3, inverter (I) 4 and notch filter (RF) 5. TKR 3 is covered by a frequency-dependent my own limiting feedback, which contains And 4, changing the phase of the oscillation by the opposite, and RF 5, tuned to the operating frequency and suppressing only the unit 1) with the frequency of the operating oscillation. The 11a feedback loop on the third .m TKRZ electrode contains in the frontal phase only the components of the side oscillations, which attracts their node1. 1 due to electromechanical communication of vibrations. Due to the suppression of noboch1) 1x ko, 1bany directly in TKR 3 decreases ko. The quality of combination- 1) 1 part. r () ziikyun1nkh due to the non-linear 11H) operation mode of the transistor 2 of the autogenerator I., you reach by performing TCR 3 and liiUMciHieM I 4 and RF 5. I il. 7 (C (LYU from 05

Description

The invention relates to radio engineering and can be used as a source of highly stable harmonic oscillations.

The purpose of the invention is to derive the spectral frequency of the oscillation generated.

In the drawing there is a schematic diagram of the proposed quartz oscillator.

The quartz generator contains an auto-oscillator 1, a transistor 2, a three-electrode quartz resonator 3, an inverter 4, and a rejector filter 5.

Quartz generator works as follows.

When you turn on 1, oscillations occur at the operating frequency for which the grinder is performed. yuvi phase balance and amplitude balance. In a three-electrode quartz resonator 3, the working oscillation due to parasitic couplings causes mechanical oscillations of various types. The frequencies of some of them are slightly different from the frequency of the operating oscillation and can also have a significant amplitude. Since the transistor 2 of the auto-oscillator 1 operates in a non-linear mode, this leads to the emergence of additional combinational frequencies and possible (in some cases) frequency jumps of the generated oscillation. However, in the proposed quartz oscillator, the third electrode of the three-electrode quartz resonator 3 is through an inverter 4 and a notch filter 5, which is tuned to the operating frequency, Led. connected to the electrode

five

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five

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With the base, the transistor 2 of the auto-oscillator 1. Inverter 4 changes the phase of the oscillations to the opposite, and the notch filter 5 only suppresses the frequency of the operating oscillation, i.e. the three-electrode crystal resonator 3 turns out to be looped frequency-dependent. negative feedback. The feedback voltage on the third electrode contains in antiphase only the components of the side oscillations, which leads to their suppression due to the electromechanical coupling of the oscillations. In addition, as a result of years of side oscillations directly in a three-electrode quartz resonator 3, the number of combination frequencies resulting from the nonlinear mode of operation of transistor 2 of the oscillator 1 decreases.

Claims (1)

Invention Formula A quartz oscillator containing an auto-oscillator coupled to a transistor according to a three-point capacitive circuit with a quartz resonator, while the first and second electrodes of the quartz resonator are connected to the collector and base of the transistor, in order to increase the spectral purity of the generated oscillations, the quartz resonator is made in the form of a three-electrode quartz resonator, between the second and third electrodes of the three-electrode quartz resonator 1 are connected in series connected input and vertor and notch filter.